<?php
/**
 * 生成缩略图
 * @author yangzhiguo0903@163.com
 * @param string     源图绝对完整地址{带文件名及后缀名}
 * @param string     目标图绝对完整地址{带文件名及后缀名}
 * @param int        缩略图宽{0:此时目标高度不能为0，目标宽度为源图宽*(目标高度/源图高)}
 * @param int        缩略图高{0:此时目标宽度不能为0，目标高度为源图高*(目标宽度/源图宽)}
 * @param int        是否裁切{宽,高必须非0}
 * @param int/float  缩放{0:不缩放, 0<this<1:缩放到相应比例(此时宽高限制和裁切均失效)}
 * @return boolean
 */
function AliyunOSS_Img2thumb($src_img, $dst_img, $width = 75, $height = 75, $cut = 0, $proportion = 0) {
	global $zbp;
	$ot = pathinfo($dst_img, PATHINFO_EXTENSION);
    $otfunc = 'image' . ($ot == 'jpg' ? 'jpeg' : $ot);
		$opts = array(
			'http'=>array(
				'method'=>"GET",
				'timeout'=>10,
			)
		);
    $srcinfo = getimagesize($src_img);
		if($srcinfo === FALSE) {
			$zbp->SetHint('bad','图片“'.$src_img.'”不存在或无法获取，请检查并重试！');
			return false;
		}
    $src_w = $srcinfo[0];
    $src_h = $srcinfo[1];
    $type  = strtolower(substr(image_type_to_extension($srcinfo[2]), 1));
    $createfun = 'imagecreatefrom' . ($type == 'jpg' ? 'jpeg' : $type);

    $dst_h = $height;
    $dst_w = $width;
    $x = $y = 0;
		
		if($cut != 1 && $width >= $src_w && $height >= $src_h) return false;
		if($cut == 1) $cut = 0;

    if(($width>$src_w&&$height>$src_h)||($height>$src_h&&$width==0)||($width>$src_w&&$height==0)) $proportion = 1;
    if($width> $src_w) $dst_w = $width = $src_w;
    if($height> $src_h) $dst_h = $height = $src_h;
    if(!$width && !$height && !$proportion) return false;
    if(!$proportion){
        if($cut == 0){
            if($dst_w && $dst_h){
                if($dst_w/$src_w> $dst_h/$src_h){
                    $dst_w = $src_w * ($dst_h / $src_h);
                    $x = 0 - ($dst_w - $width) / 2;
                }else{
                    $dst_h = $src_h * ($dst_w / $src_w);
                    $y = 0 - ($dst_h - $height) / 2;
                }
            }else if($dst_w xor $dst_h){
								if($dst_w && !$dst_h){
                    $propor = $dst_w / $src_w;
                    $height = $dst_h  = $src_h * $propor;
                }
                else if(!$dst_w && $dst_h){
                    $propor = $dst_h / $src_h;
                    $width  = $dst_w = $src_w * $propor;
                }
            }
        }else{
						if(!$dst_h) $height = $dst_h = $dst_w;
            if(!$dst_w)  $width = $dst_w = $dst_h;
            $propor = min(max($dst_w / $src_w, $dst_h / $src_h), 1);
            $dst_w = (int)round($src_w * $propor);
            $dst_h = (int)round($src_h * $propor);
            $x = ($width - $dst_w) / 2;
            $y = ($height - $dst_h) / 2;
        }
    }else{
        $proportion = min($proportion, 1);
        $height = $dst_h = $src_h * $proportion;
        $width  = $dst_w = $src_w * $proportion;
    }

		$src = $createfun($src_img);
    $dst = imagecreatetruecolor($width ? $width : $dst_w, $height ? $height : $dst_h);
    $white = imagecolorallocate($dst, 255, 255, 255);
    imagefill($dst, 0, 0, $white);

    if(function_exists('imagecopyresampled')){
        imagecopyresampled($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);
    }else{
        imagecopyresized($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h);
    }
    $otfunc($dst, $dst_img, $type=="png"?9:100);
    imagedestroy($dst);
    imagedestroy($src);
    return true;
}